Habitat

The Cuban treefrog inhabits freshwater, tropical, and terrestrial habitats. This species can be found in mountain, forest, and coastal biomes, as well as urban and suburban areas. The Cuban treefrog typically inhabits xeric habitats. The maximum elevation the Cuban treefrog inhabits is 1110 m. The Cuban treefrog is successful in the dry habitat of Florida. This frog is often found around buildings and disturbed areas in suburban southern Florida, including in houses. The surplus of insects and other prey in suburban areas, attracts this species to urban areas. The determining factor in the distribution of this species in the southeastern United States is climate. ("The Cuban treefrog (Osteopilus septentrionalis) in Florida", 2013; Hedges, et al., 2010; Maskell, et al., 2003; Meshaka Jr, 1996)

Physical Description

On average, Osteopilus septentrionalis is 2.5 to 12 cm long. Its size is a distinguishing feature as one of the largest of the treefrog species found in Florida. The female can be almost twice as large as the male. The Cuban treefrog has bulging eyes. This frog can be identified by its expanded pads on the end of its toes, giving it the ability to climb. Coloration varies across individuals. Most tend to be white to light brown, but can include green to dark brown, with a white, coarse abdomen. These frogs develop into froglets when the tadpoles reach a length of 1.25 to 1.91 cm. Osteopilus septentrionalis weighs 57 g, on average. ("The Cuban treefrog (Osteopilus septentrionalis) in Florida", 2013; Crump, 1986; Dorcas and Gibbons, 2008; Lannoo, 2005; McGarrity and Johnson, 2009)

Development

Once a female Cuban treefrog lays a clutch of eggs, the eggs float on the surface of the water and will only survive in temperatures above 27° Celsius. The eggs hatch quickly, within a day. In the presence of temperatures above 35° Celsius a tadpole will undergo metamorphosis relatively quickly, in 3 weeks. However, with cooler temperatures metamorphosis typically takes up to a month. The tadpole is round-bodied with dorsal darker colors and lighter colors on the ventral side. It can be identified by a transparent pointed tail fin with spots and a brown tint. Dorcas and Gibbons (2008) report that the tadpole develops into a froglet when it reaches a length of 1.27 to 1.91 cm. The female Cuban treefrog grows quicker yet matures later than the male. No exact growth rates have been reported. More data are needed to evaluate the accuracy of the relationship between growth and maturation. Growth is indeterminate. (Dorcas and Gibbons, 2008; Lannoo, 2005)

Reproduction

Males and females are polygynandrous which means males and females have multiple mates. The mating ritual of this treefrog involves a large chorus call by the male to attract the female. Beyond this chorus, breeding is random. (Lannoo, 2005)

The most suitable habitat for breeding for the Cuban treefrog is a warm, humid area. After heavy rainstorms during the wet season in the Everglades, large populations of adults move to breeding sites and the male attracts the female through chorus calls. Breeding is typically random. The male Cuban treefrog reaches sexual maturity at 120 days, on average. The female treefrog reaches sexual maturity at 255 days, on average.

In the Cuban treefrog's native habitat of Cuba and in Florida, breeding in aquatic environments occurs throughout the year, with peaks during the wet season from May to October. This frog is oviparous with external fertilization by the male. The female Cuban treefrog lays over 3,000 eggs, laying them 75 to 1,000 at a time. As female body size increases, female fecundity increases. The eggs float on the surface of the water and will only survive in the presence of adequate ambient temperatures above 27° Celsius. The eggs hatch quickly, within 24 to 32 hours. In water temperatures above 35° Celsius, tadpoles will undergo metamorphosis relatively quickly, in 3 weeks. However with temperatures below 29° Celsius, metamorphosis typically takes a month. There is no parental care and this treefrog is immediately independent. (AnAge, 2014; Dorcas and Gibbons, 2008; Lannoo, 2005; McGarrity and Johnson, 2009; Salinas, 2006)

Behavior

The Cuban treefrog is generally nocturnal, being most active from dusk to dawn. When temperatures are below 9.5° Celsius, the Cuban treefrog goes into a state of torpor. The Cuban treefrog is generally a terrestrial species, but migrates en masse to breeding sites following heavy rainstorms.

Mating behaviors are fairly generic. The male Cuban treefrog attracts the female through large chorus mating calls. The female Cuban treefrog non-selectively mates with a male and the male fertilizes eggs from any female.

This frog is saltatorial and motile. The Cuban treefrog is an ambush predator. When captured by a predator, the Cuban treefrog will inflate its body and release defensive compounds that are toxic to humans and other mammalian predators. (Dorcas and Gibbons, 2008; Lannoo, 2005)

Home Range

Home range has not been reported for this species. However, when McGarrity and Johnson (2010) moved treefrog individuals 200m away from their original location, movements measured per day averaged just 9 and 21 m when moved to a field and a forest, respectively. They do not appear to be territorial. (McGarrity and Johnson, 2010)

Communication and Perception

During breeding season, males attract females with a large chorus call, a combination of a "quahh" (Dorcas and Gibbons 2008) and a croak. Cuban treefrogs have a distinct call that sounds similar to that of a southern leopard frog Lithobates sphenocephalus.
Adult treefrogs have skin with defensive compounds that are extremely toxic to humans and other mammalian predators. When this treefrog is taken by a predator, a loud distress call is emitted and the body inflates. This may attract other animals to distract the predator.
Limited research is available on visual function in the family Hylidae. It is known that
amphibians have two photoreceptor rod classes, green rods and red rods, allowing for color vision and vision at low light levels. (Dorcas and Gibbons, 2008; King, et al., 1993)

Ecosystem Roles

The Cuban treefrog negatively impacts ecosystems and native species in Florida because it is a known predator of native treefrogs in Florida, colonizing and taking over natural areas populated by native species.
The Cuban treefrog, specifically in Tampa, Florida, is susceptible to various parasites whether introduced or acquired, including nematodes (Oswaldocruzie lenteixeirai, Aplectana species, Physaloptera species, and Rhabdias species), trematodes (Digenean metacercaria) and cestodes Cylindrotaenia americana). Aplectana species are most prevalent in the Cuban treefrog species found in Tampa, Florida. In its native range in Cuba, reported parasites include nematodes (Parapharyngodon osteopilli) and trematodes (Mesocoelium crossophorum), which infect the small intestines and stomach of the treefrog. ("The Cuban treefrog (Osteopilus septentrionalis) in Florida", 2013; Ortega, et al., 2015)

Economic Importance for Humans: Positive

This frog species has no positive economic importance for humans.

Economic Importance for Humans: Negative

The Cuban treefrog is poisonous and releases a skin mucous that is toxic and a potential health hazard to humans. The Cuban treefrog is a household pest that negatively impacts humans by entering homes through plumbing systems, clogging toilets and sink drains. This frog species is also known to invade bird nesting boxes, which can be a troublesome for wildlife enthusiasts. (Maclean, 1989)

Conservation Status

The Cuban treefrog is listed by the IUCN as "Least Concern." In southern Florida and along the coastline, the Cuban treefrog is a predator and competitor to native frog species which has led to anti-conservation efforts to protect native species. Blaustein et al. (2010) reports that various climate change predictions show the possibility of further expansion of the Cuban treefrog in North America. This frog is not given any special conservation status on the US Federal List or CITES. (Blaustein, et al., 2010; Dorcas and Gibbons, 2008; Maskell, et al., 2003)

Glossary

Nearctic

living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.

acoustic

uses sound to communicate

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.

carnivore

an animal that mainly eats meat

chemical

uses smells or other chemicals to communicate

choruses

to jointly display, usually with sounds, at the same time as two or more other individuals of the same or different species

coastal

the nearshore aquatic habitats near a coast, or shoreline.

ectothermic

animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature

external fertilization

fertilization takes place outside the female's body

female parental care

parental care is carried out by females

fertilization

union of egg and spermatozoan

forest

forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.

freshwater

mainly lives in water that is not salty.

herbivore

An animal that eats mainly plants or parts of plants.

heterothermic

having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.

hibernation

the state that some animals enter during winter in which normal physiological processes are significantly reduced, thus lowering the animal's energy requirements. The act or condition of passing winter in a torpid or resting state, typically involving the abandonment of homoiothermy in mammals.

indeterminate growth

Animals with indeterminate growth continue to grow throughout their lives.

insectivore

An animal that eats mainly insects or spiders.

introduced

referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.

iteroparous

offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).

metamorphosis

A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.

motile

having the capacity to move from one place to another.

mountains

This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.

native range

the area in which the animal is naturally found, the region in which it is endemic.

nocturnal

active during the night

oviparous

reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.

pheromones

chemicals released into air or water that are detected by and responded to by other animals of the same species

poisonous

an animal which has a substance capable of killing, injuring, or impairing other animals through its chemical action (for example, the skin of poison dart frogs).

polygynandrous

the kind of polygamy in which a female pairs with several males, each of which also pairs with several different females.

saltatorial

specialized for leaping or bounding locomotion; jumps or hops.

sedentary

remains in the same area

sexual

reproduction that includes combining the genetic contribution of two individuals, a male and a female

suburban

living in residential areas on the outskirts of large cities or towns.

tactile

uses touch to communicate

terrestrial

Living on the ground.

tropical

the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.

urban

living in cities and large towns, landscapes dominated by human structures and activity.

vibrations

movements of a hard surface that are produced by animals as signals to others

Disclaimer:
The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.

This material is based upon work supported by the
National Science Foundation
Grants DRL 0089283, DRL 0628151, DUE 0633095, DRL 0918590, and DUE 1122742. Additional support has come from the Marisla Foundation, UM College of Literature, Science, and the Arts, Museum of Zoology, and Information and Technology Services.